Hematite (Fe2O3)
- Formula: Fe2O3
- Molecular weight: 159.688
- CAS Registry Number: 1317-60-8
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Solid Phase Heat Capacity (Shomate Equation)
Go To: Top, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. to 950. | 950. to 1050. | 1050. to 2500. |
|---|---|---|---|
| A | 22.33230 | 36.00000 | 26.51439 |
| B | 25.89811 | 0.000000 | 7.659451 |
| C | -12.15690 | 0.000000 | -2.197021 |
| D | 6.115400 | 0.000000 | 0.215465 |
| E | -0.385117 | 0.000000 | 1.298680 |
| F | -206.3120 | -209.2750 | -201.5170 |
| G | 38.49711 | 60.44011 | 54.57811 |
| H | -197.3000 | -197.3000 | -197.3000 |
| Reference | Chase, 1998 | Chase, 1998 | Chase, 1998 |
| Comment | hematite phase; Data last reviewed in June, 1965 | hematite phase; Data last reviewed in June, 1965 | hematite phase; Data last reviewed in June, 1965 |
| Temperature (K) |
Cp (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 298. | 24.80 | 20.86 | 20.89 | -0.01 |
| 300. | 24.89 | 21.03 | 20.89 | 0.04 |
| 400. | 28.73 | 28.75 | 21.92 | 2.74 |
| 500. | 31.47 | 35.47 | 23.97 | 5.75 |
| 600. | 33.75 | 41.42 | 26.39 | 9.01 |
| 700. | 35.82 | 46.77 | 28.93 | 12.49 |
| 800. | 37.80 | 51.69 | 31.47 | 16.17 |
| 900. | 39.78 | 56.25 | 33.97 | 20.05 |
| Temperature (K) |
Cp (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 950. | 36.00 | 58.59 | 35.20 | 22.23 |
| 1000. | 36.00 | 60.44 | 36.42 | 24.03 |
| Temperature (K) |
Cp (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 1050. | 33.56 | 62.20 | 37.60 | 25.83 |
| 1100. | 33.64 | 63.76 | 38.75 | 27.51 |
| 1200. | 33.82 | 66.69 | 40.96 | 30.88 |
| 1300. | 34.00 | 69.41 | 43.05 | 34.27 |
| 1400. | 34.19 | 71.94 | 45.02 | 37.68 |
| 1500. | 34.36 | 74.30 | 46.90 | 41.11 |
| 1600. | 34.53 | 76.52 | 48.68 | 44.55 |
| 1700. | 34.69 | 78.62 | 50.38 | 48.01 |
| 1800. | 34.84 | 80.61 | 52.00 | 51.49 |
| 1900. | 34.97 | 82.50 | 53.56 | 54.98 |
| 2000. | 35.09 | 84.29 | 55.05 | 58.48 |
| 2100. | 35.20 | 86.01 | 56.48 | 62.00 |
| 2200. | 35.29 | 87.65 | 57.86 | 65.52 |
| 2300. | 35.38 | 89.22 | 59.19 | 69.06 |
| 2400. | 35.45 | 90.73 | 60.48 | 72.60 |
| 2500. | 35.51 | 92.17 | 61.72 | 76.15 |
References
Go To: Top, Solid Phase Heat Capacity (Shomate Equation), Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Notes
Go To: Top, Solid Phase Heat Capacity (Shomate Equation), References
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